Built in the early 1980s in great secrecy, the revolutionary Tacit Blue tested advanced radar sensors and new ideas in stealth technology. It was inherently highly unstable but had a digital fly-by-wire system to control it. Using advanced sensors, it could loiter behind enemy lines, continuously monitoring and providing valuable information through data links. It flew 135 times before the program ended in 1985. The aircraft was declassified and placed on display at the museum in 1996